Fig. 3. HER tests in 1 M KOH. (a) The HER polarization plots for different catalysts at a scan rate of 5 mV s–1. (b) Tafel plots and exchange currents for different catalysts. (c) The capacitive currents at different scan rates. The mass loading is 0.50 mg cm–2 supported on a glassy carbon (GC) electrode for the tests in (a–c). (d) The stability test for Ni/Mo2C-PC on Ni foam with a loading of 2 mg cm–2.
